Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-06-17
Astronomy and Astrophysics
Astrophysics
23 pages in TeX, 7 figures, presented at the "XLIII Congresso Nazionale Della Societa' Astronomica Italiana - Le Rivoluzioni i
Scientific paper
The topic of the paper is the mathematical analysis of a radially decelerated Hubble expansion from the Bahcall & Soneira void center. Such analysis, in the hypothesis of local homogeneity and isotropy, gives a particular Hubble ratio dipole structure to the expansion equation, whose solution has been studied at different precision orders and successfully tested on a few historic data sets, by de Vaucouleurs (1965), by Sandage & Tammann (1975), and by Aaronson et al. (1982-86). The fittings of both the separate AA1 and AA2 samples show a good solution convergence as the analysis order increases, giving even coinciding solutions when applied to 308 nearby individual galaxies (308AA1) and to 10 clusters (148AA2), respectively.
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